1 files changed, 117 insertions, 0 deletions
diff --git a/tests/fcntl_lock_thread.c b/tests/fcntl_lock_thread.c
new file mode 100644
index 0000000..e341514
--- /dev/null
+++ b/tests/fcntl_lock_thread.c
@@ -0,0 +1,117 @@
+/* test whether fcntl locking works between threads on this Linux system */
+
+#include <unistd.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+
+#include <sys/fcntl.h>
+
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <pthread.h>
+
+#define DATA "conftest.fcntl"
+
+#define SEEK_SET 0
+
+static void *test_thread(void *thread_parm)
+{
+	int *status = thread_parm;
+	int fd, ret;
+	struct flock lock;
+	
+	sleep(2);
+	fd = open(DATA, O_RDWR);
+
+	if (fd == -1) {
+		fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n", 
+			DATA, (int)errno);
+		pthread_exit(thread_parm);
+	}
+
+	lock.l_type = F_WRLCK;
+	lock.l_whence = SEEK_SET;
+	lock.l_start = 0;
+	lock.l_len = 4;
+	lock.l_pid = 0;
+		
+	/* check if a lock applies */
+	ret = fcntl(fd,F_SETLK,&lock);
+	if ((ret != -1)) {
+		fprintf(stderr,"ERROR: lock test failed (ret=%d errno=%d)\n", ret, (int)errno);
+	} else {
+		*status = 0;  /* SUCCESS! */
+	}
+	pthread_exit(thread_parm);
+}
+
+/* lock a byte range in a open file */
+int main(int argc, char *argv[])
+{
+	struct flock lock;
+	int fd, ret, status=1, rc;
+	pid_t pid;
+	char *testdir = NULL;
+	pthread_t thread_id;
+	pthread_attr_t thread_attr;
+
+	testdir = getenv("TESTDIR");
+	if (testdir) chdir(testdir);
+
+	alarm(10);
+
+	pthread_attr_init(&thread_attr);
+	pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
+	rc = pthread_create(&thread_id, &thread_attr, &test_thread, &status);
+	pthread_attr_destroy(&thread_attr);
+	if (rc == 0) {
+		fprintf(stderr,"created thread_id=%lu\n", 
+			(unsigned long int)thread_id);
+	} else {
+		fprintf(stderr,"ERROR: thread create failed, rc=%d\n", rc);
+	}
+
+	unlink(DATA);
+	fd = open(DATA, O_RDWR|O_CREAT|O_RDWR, 0600);
+
+	if (fd == -1) {
+		fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n", 
+			DATA, (int)errno);
+		exit(1);
+	}
+
+	lock.l_type = F_WRLCK;
+	lock.l_whence = SEEK_SET;
+	lock.l_start = 0;
+	lock.l_len = 4;
+	lock.l_pid = getpid();
+
+	/* set a 4 byte write lock */
+	fcntl(fd,F_SETLK,&lock);
+
+	sleep(4);  /* allow thread to try getting lock */
+
+	unlink(DATA);
+
+#if defined(WIFEXITED) && defined(WEXITSTATUS)
+    if(WIFEXITED(status)) {
+        status = WEXITSTATUS(status);
+    } else {
+        status = 1;
+    }
+#else /* defined(WIFEXITED) && defined(WEXITSTATUS) */
+	status = (status == 0) ? 0 : 1;
+#endif /* defined(WIFEXITED) && defined(WEXITSTATUS) */
+
+	if (status) {
+		fprintf(stderr,"ERROR: lock test failed with status=%d\n", 
+			status);
+	}
+
+	exit(status);
+}